<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CSS Test: Height determination for block-level non-replaced elements in normal flow when 'overflow' computes to 'visible' and elements' margins collapse</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#normal-block" />
        <meta name="flags" content="" />
        <meta name="assert" content="The 'height' is the distance between the top border edge of the top most block-level child box that doesn't have margins collapsed through it, and the bottom border edge of the bottommost block-level child that doesn't have margins collapsed through it. When a block-level non-replaced element is in normal flow, 'overflow' computes to 'visible' and the 'height' is 'auto'." />
        <style type="text/css">* { margin: 0; padding: 0 }
            #div1
            {
                position: relative;
            }
            #div2, #div3, #div4
            {
                width: 1in;
            }
            #div2, #div3
            {
                background: blue;
                height: 0.5in;
            }
            #div2
            {
                border-top: 0.5in solid blue;
                margin-top: 0.5in;
            }
            #div3
            {
                border-bottom: 0.5in solid blue;
                margin-bottom: 0.5in;
            }
            #div4
            {
                background: blue;
                height: 2in;
                left: 1in;
                position: absolute;
                top: 0;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is a blue square below.</p>
        <div id="div1">
            <div id="div2"></div>
            <div id="div3"></div>
            <div id="div4"></div>
        </div>
    </body>
</html>